Convert the following into balanced equations:
(a) When lead(II) nitrate solution is added to potassium iodide solution, solid lead(II) iodide forms and potassium nitrate solution remains.

Answer:

B

Explanation:

i think with exothermic reactions heat is released

this is what i looked up

hope this helps i took chem last year and think this is what i learned

Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.

Energy is the ability to do work or to produce heat.

Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.

Chemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.

So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.

An endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.

In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.

When ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.

So, the correct answer is second option: the reaction is endothermic.

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The expression to be rearranged K = [CO][Cl₂] [COCI₂]  are x = 0.327 or x = 339.

The expression to be rearranged K = [CO][Cl₂] [COCI₂] is:

(0.156 - x) (0.156 - x) (0.263 + x) = 5.00 × 10⁻²

We will expand and simplify the expression:

(0.156 - x) (0.156 - x) (0.263 + x) = 5.00 × 10⁻²(0.156)² + (0.156)(x) - (x)(0.156) - (x)² (0.263 + x)

= 5.00 × 10⁻²(0.156)² - (0.263)(0.156)(x) - (0.156)(x) + (0.263)(0.156)(x) + x²(0.263 + x) - 5.00 × 10⁻² = 0

After simplifying:

-0.0132302 x² - 0.001002 x + 0.0014256 = 0

This is in the form ax² + bx + c = 0 where a = -0.0132302, b = -0.001002 and c = 0.0014256

Using the quadratic formula, we have:

\(\[x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}\]\)

Substituting values, we get:

\(\[x = \frac{-(-0.001002) \pm \sqrt{(-0.001002)^2-4(-0.0132302)(0.0014256)}}{2(-0.0132302)}\]\)

Solving, we get:x = 0.327 or 3.39 × 10²

Therefore, the solutions are x = 0.327 or x = 339.

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Answer:

b bitter

Explanation: can i have brainlist please

The sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

The force exerted by a gas on specific area is known as gas pressure..

As we know, (P₁ V₁) /(T₁) = (P₂V₂) /(T₂)

Given, P₁ is the initial pressure (452 torr); V₁ is initial volume (32.2 mL)

T₁ is initial temperature in Kelvin (30 °C + 273.15 = 303.15 K)

P₂ is final pressure (452 torr); V₂ is final volume (what we want to find)

T₂ is the final temperature in Kelvin (-70 °C + 273.15 = 203.15 K)

Now, V2 = (P₁ V₁ T₂) / (P2 T₁)

V₂ = (452 torr x 32.2 mL x 203.15 K) / (452 torr x 303.15 K)

V₂ ≈ 18.5 mL

Therefore, the sample of oxygen will occupy approximately 18.5 mL at -70 °C and the same pressure.

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Answer:

Lithium

Pro.=3

Neu. =4

Elec.= 3

Mass = 6.941

Explanation:

The average speed is approximately 19.0 kilometers per hour.

When we say the average speed is approximately 19.0 kilometers per hour, it means that over a given time period, the object or person in question traveled a total distance of 19.0 kilometers divided by the total time it took to cover that distance. In this case, the given speed is 19 kilometers per hour.

To calculate the average speed, we use the formula:

Average Speed = Total Distance / Total Time

In the given question, the speed is already mentioned as 19 kilometers per hour. So, we can conclude that the total distance covered is 19 kilometers.

However, to find the total time taken, we need more information. The question only provides the speed but not the duration of the journey. Without knowing the total time, we cannot determine the average speed accurately. Therefore, in the absence of further information about the time, we can only state that the average speed is approximately 19.0 kilometers per hour based on the given speed.

Average speed and how it is calculated by considering the total distance and total time traveled.

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Answer:

4FeS +3O2-2Fe2O3+4SO2

The mass of ZnCl2 that can be produced is 0.496 g.

The balanced equation for the reaction between zinc (Zn) metal and hydrochloric acid (HCl) is: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

The molar mass of Zn is 65.38 g/mol and the molar mass of ZnCl2 is 136.29 g/mol.

To determine the mass of ZnCl2 that can be produced from 0.238 g of Zn, we need to use stoichiometry.

To do this:

First, convert the given mass of Zn to moles by dividing by its molar mass: 0.238 g Zn × (1 mol Zn/65.38 g Zn) = 0.00364 mol Zn

Since the balanced equation shows that 1 mole of Zn reacts with 1 mole of ZnCl2, then the number of moles of ZnCl2 produced will be the same as the number of moles of Zn.

Thus,0.00364 mol ZnCl2 will be produced from 0.238 g Zn.

To convert the moles of ZnCl2 to grams, we multiply by its molar mass:0.00364 mol ZnCl2 × 136.29 g ZnCl2/mol ZnCl2 = 0.496 g ZnCl2

Therefore, the mass of ZnCl2 that can be produced is 0.496 g.

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1.  the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.  the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.

1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.

First, let's calculate the moles of NaOH in the initial solution:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles

After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.

To find the final concentration, we divide the moles of NaOH by the total volume:

final concentration of NaOH = moles of NaOH / total volume

final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M

Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.

First, calculate the moles of KOH in the initial solution:

moles of KOH = volume (in L) × concentration (in M)

moles of KOH = 0.125 L × 3.01 M = 0.37625 moles

After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.

To find the final concentration, divide the moles of KOH by the total volume:

final concentration of KOH = moles of KOH / total volume

final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M

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Answer:

0.32M

Explanation:

Using the following formula;

CaVa = CbVb

Where;

Ca = concentration of acid (M)

Cb = concentration of bass (M)

Va = volume of acid (HCl)

Vb = volume of base (NaOH)

According to this question, the following were given:

Ca = ?

Cb = 2M

Va = 1.824L

Vb = 0.294L

Using CaVa = CbVb

Ca × 1.824 = 0.294 × 2

1.824Ca = 0.588

Ca = 0.588 ÷ 1.824

Ca = 0.32M

Answer:gear

Explanation:just did it right now

Answer: Gear

Explanation: just did it on Edge 2021

36.2L of N2 can be produced.

1st) According to the stoichiometry of the reaction, 2 moles of NaN3 produce 3 moles of N2. Using the molar mass of NaN3 (65.0g/mol ) and N2 (28.0g/mol) we can convert the moles to mass, and we can see that with 130.0g of NaN3 we can produce 84.0g of N2.

Now, we can use a mathematical rule of three to calculate the grams of N2 that can be produced from 71.0g of NaN3:

So, 45.9g of N2 are produced from 71.0g of NaN3.

2nd) It is necessary to convert the grams of N2 produced to moles, so we can use it in the Ideal gas equation:

Now we know that 1.6mol of N2 are produced.

3rd) To calculate the volume of N2, it is necessary to use the Ideal gas equation and replace the values of Pressure (P), Temperature (T, in Kelvin) and Number of moles (n):

Finally, 36.2L of N2 can be produced from 71.0g of NaN3.

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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I hope this helps, you can ask any questions for clarification

Answer:

at the center of the mid-ocean ridge

Explanation:

Answer:

Anywhere along the mid-atlantic ridge

Explanation:

It goes through a bunch of history, such as the Continental Drift Theory from Alfred Wegener to Harry Hess proving it. So, in WW2, Harry Hess was in the navy (he was a geographer/geologist who noticed while using sonar, that the waves were bouncing back uneven when they launched sonar, which proved the ocean floor was not flat like how they used to beleive it was.

Anyways, they discovered the mid-atlantic ridge, (you can see it on maps! Go to a search engine's maps and look at the atlantic ocean and you can see this weird ridges along with these (not latitude or longitude) lines.

The mantle in the Earth's layers is moving the plates (continental and oceanic plates to be exact) from convection currents, and there is very deep trenches in the Earth, such as the Mariana Trench. The mantle pushes magma through some holes, and it rises and cools in the ocean, which is then pushed aside by more solidifiying magma in a process called seafloor spreading. Magma is called lava when it comes out of the place where it comes from, so the lava cools into rock which is called basalt too.

Hope this helps anyone in the future!

I don't mean to be a boomer by necroposting

dont roast me plz

Answer:

B

Explanation:

Answer:

The first one

When two aqueous solutions react, they sometimes form solids in the solution. The solid is called a precipitate.

Answer:

c.

Explanation:

This is because the chemist will get the average of the experiment from multiple attempts but not precision because the experiment is complex rather than simple.

The chemist will most likely have high accuracy, but low precision. A

chemist who has been performing experiments frequently will be accurate

when taking the required measurements for the experiment due to the

frequency.

Precision however won't be affected because precision deals with how

close his results from the experiment are. The complexity of the

experiment and the different variables used makes him likely to have low

precision.

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Explanation:

, the maximum mass of NaBr that can be produced is 5.14 g (rounded to two significant figures to match the significant figures in the given masses of reactants).

balanced chemical equation for the reaction between hydrobromic acid and sodium hydroxide is:

HBr (aq) + NaOH (s) → NaBr (aq) + H₂O (l)

To determine the maximum mass of sodium bromide that can be produced, we need to first calculate the limiting reactant, which is the reactant that is completely consumed in the reaction.

The molar mass of HBr is 80.91 g/mol, and the molar mass of NaOH is 40.00 g/mol. Using these values, we can calculate the number of moles of each reactant:

moles of HBr = 4.05 g / 80.91 g/mol = 0.050 mol

moles of NaOH = 3.7 g / 40.00 g/mol = 0.0925 mol

Since NaOH has a higher number of moles, it is in excess, and HBr is the limiting reactant.

Using the balanced chemical equation, we can now calculate the theoretical yield of NaBr:

1 mol HBr produces 1 mol NaBr

0.050 mol HBr produces 0.050 mol NaBr

The molar mass of NaBr is 102.89 g/mol, so the mass of NaBr produced is:

mass of NaBr = 0.050 mol × 102.89 g/mol = 5.1445 g

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The maximum mass of sodium bromide that could be produced by this reaction is approximately 5.14 g, considering the correct number of significant digits.

To calculate the maximum mass of sodium bromide that could be produced by the reaction of aqueous hydrobromic acid and solid sodium hydroxide, we'll follow these steps:

1. Write the balanced chemical equation: HBr(aq) + NaOH(s) → NaBr(aq) + H₂O(l)
2. Calculate the moles of reactants:
  - For HBr (molecular weight = 80.91 g/mol): moles = 4.05 g / 80.91 g/mol ≈ 0.0500 mol
  - For NaOH (molecular weight = 40.00 g/mol): moles = 3.7 g / 40.00 g/mol ≈ 0.0925 mol
3. Determine the limiting reactant: Since the stoichiometry is 1:1, HBr is the limiting reactant with 0.0500 mol.
4. Calculate the moles of NaBr produced: 0.0500 mol HBr × (1 mol NaBr / 1 mol HBr) = 0.0500 mol NaBr
5. Calculate the mass of NaBr produced (molecular weight = 102.89 g/mol): mass = 0.0500 mol × 102.89 g/mol ≈ 5.14 g

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Answer:

Agriculture, manufacturing, and food processing.

Explanation:

I think these are the answers if they are wrong I apologize.

1. Agriculture: raising crops, livestock and seafood.

2. Manufacturing: agrochemicals, agricultural construction, farm machinery and supplies, seed, etc.

3. Food processing: preparation of fresh products for market, and manufacture of prepare food products.

I hope this helps!

The three major systems include: crops only, livestock only, and an integrated crops and livestock system.

Food production methods:

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Explanation:

the last CH2 should CH3

because the first and last carbons are bonded to three hydrogens

When oil from a tin is poured through a funnel placed tightly into the neck of a bottle, the oil stays in the funnel because the air pressure inside the bottle prevents the oil from entering the bottle.

The force that air, whether compressed or unconfined, applies to whatever surface it comes into touch with is known as air pressure.

The air in the bottles exerts a force on the liquid that is to be poured inside it.

Since the air has no way of escaping, the oil cannot be poured into the bottle.

However, if a little space is allowed by the funnel for the air to escape, the liquid can then be poured into the bottle.

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The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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The standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

Given: ΔT = 15 K and ∆K/K = 1/2

Temperature is directly proportional to equilibrium constant K,

So, ∆T/T = ∆K/K

This can be written as ∆K/K = ΔH°/R × (1/T2 − 1/T1)

On solving this equation, we getΔH° = −2.303 × R × ΔK/K × T2T2 = 310 + 15 = 325 K∆K/K = 1/2∆H° = −2.303 × 8.314 J mol−1 K−1 × 1/2 × 325 K∆H° = −955.7 J mol−1= −0.956 kJ/mol

Therefore, the standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

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Answer:

protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.

Answer:

218.09g

Explanation:

the formula for density is mass/volume

you have volume so rlly what you have is 19.3g/cm3=m/11.3cm3

so mass equals density x volume

and 19.3 x 11.3 = 218.09